I always keep the admin username with a super strong password.
I have seen hacks where if the username was not in use, they created a user named "admin".
your bigger risk for entry is unsecure plugins and scripts on the server.
These forums were CLOSED to new posts on November 19th, 2012. New forums are here: http://www.studiopress.com/forums/
and you will need to SIGN UP AGAIN.
If you need assitance with setting up your theme, go to http://my.studiopress.com/
and read the SETUP links or the TUTORIALS link on the side tab.
If you need Account Assistance
, file a help desk ticket at the same location.